EP3853981B1 - Hilfseinheit für ein kraftfahrzeug - Google Patents

Hilfseinheit für ein kraftfahrzeug Download PDF

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Publication number
EP3853981B1
EP3853981B1 EP18772788.8A EP18772788A EP3853981B1 EP 3853981 B1 EP3853981 B1 EP 3853981B1 EP 18772788 A EP18772788 A EP 18772788A EP 3853981 B1 EP3853981 B1 EP 3853981B1
Authority
EP
European Patent Office
Prior art keywords
stator body
contact
motor
motor vehicle
auxiliary unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18772788.8A
Other languages
English (en)
French (fr)
Other versions
EP3853981A1 (de
Inventor
Nenad PAVKOVIC
Timo KERSTEN
Christian Schulz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pierburg Pump Technology GmbH
Original Assignee
Pierburg Pump Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pierburg Pump Technology GmbH filed Critical Pierburg Pump Technology GmbH
Publication of EP3853981A1 publication Critical patent/EP3853981A1/de
Application granted granted Critical
Publication of EP3853981B1 publication Critical patent/EP3853981B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/141—Stator cores with salient poles consisting of C-shaped cores
    • H02K1/143—Stator cores with salient poles consisting of C-shaped cores of the horse-shoe type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics

Definitions

  • the invention is directed to a motor vehicle auxiliary unit, for example to an electric gas pump for pumping fuel vapor out of a motor vehicle fuel tank.
  • Such a motor vehicle auxiliary unit comprises an electronically commutated electric motor with a permanent magnetic motor rotor, with a motor stator with a ferromagnetic stator body and at least one stator coil, as well as with a motor electronics with a ground terminal for electrically connecting the motor electronics with an external vehicle ground potential.
  • the motor vehicle auxiliary unit also comprises a unit connector plug for externally energizing and, optionally, for controlling the motor vehicle auxiliary unit.
  • the unit connector plug comprises at least an external-ground connector lug for electrically connecting the motor vehicle auxiliary unit with an external vehicle ground potential.
  • the external-ground connector lug is internally directly connected with the motor electronics ground terminal for electrically connecting the motor electronics ground terminal with the external vehicle ground potential.
  • the electronically commutated electric motor of the motor vehicle auxiliary unit generates electromagnetic interference radiation, which can cause malfunctions or even failure of other electronic devices in the vicinity of the electric motor.
  • the interference radiation can, for example, interfere with the motor electronics of the electric motor.
  • electronic devices have to fulfill application-specific electromagnetic compatibility (EMC) directives.
  • EMC electromagnetic compatibility
  • the electric motor is provided with a stator body contact element providing a direct electric connection between the motor electronics ground terminal and the stator body to minimize the electromagnetic interference radiation being generated by the electric motor.
  • An electric motor with a stator body contact element electrically connecting the stator body with the motor electronics is, for example, disclosed in EP 3 007 330 B1 .
  • the stator body contact element is fixed to the stator body with one axial end and is plugged into a motor electronics ground terminal with the opposite axial end.
  • the stator body contact element has to be exactly positioned and aligned during the assembling process to fit into the corresponding motor electronics terminal.
  • EP 3 340 444 A2 discloses a radiator fan module with an electric motor and with a connector cable.
  • the radiator fan module comprises a punched-grid connection element for connecting wires of the connector cable with a printed circuit board.
  • the punched-grid connection element comprises a stator body contact element which provides an electric connection between an external-ground wire of the connector cable and a stator body of the electric motor.
  • EP 2 500 576 A1 discloses a heating system circulator pump with an electric motor and with a connector plug.
  • the connector plug comprises an external-ground connector lug which is directly electrically connected with a ground terminal of a circuit board.
  • the external-ground connector lug comprises a housing contact element which provides a direct electric connection with a housing of the electric motor.
  • the electric motor of the motor vehicle auxiliary unit is also provided with a motor electronics being electrically connected with the stator coil for energizing the stator coil and thereby driving the motor rotor.
  • the motor electronics comprises several power semiconductors for commutating the electric drive energy being provided to the stator coil.
  • the motor electronics also comprises a ground terminal for electrically connecting the motor electronics with an external vehicle ground potential to provide the motor electronics with electric energy.
  • the motor vehicle auxiliary unit is also provided with a unit connector plug for externally energizing and controlling the motor vehicle auxiliary unit.
  • the unit connector plug comprises at least an external-ground connector lug for electrically connecting the motor vehicle auxiliary unit with an external vehicle ground potential.
  • the external-ground connector lug is made of a metal and provides a direct low-resistive electric connection with the motor electronics ground terminal. All connector lugs of the unit connector plug are typically simultaneously stamped out of a metal sheet and are post-processed by a mechanical deformation process.
  • the external-ground connector lug is provided with an integral stator body contact element providing a direct electric connection with the stator body.
  • the external-ground connector lug is provided as a single-piece three-way electric connector providing a direct electric interconnection between an external contact pin being electrically connectable with the vehicle ground potential, the motor electronics and the stator body.
  • the stator body contact element extends from the external contact pin to the stator body and is reliably fixed to the stator body, for example by overmolding.
  • the electric connection with the motor electronics is provided by an integral motor electronics contact element which extends from the external contact pin to the motor electronics and typically is plugged into a correspondingly shaped ground terminal of the motor electronics.
  • stator body contact element is integrated into the unit connector plug, no additional contact element is required, which has to be separately mounted and aligned.
  • the motor vehicle auxiliary unit according to the invention can be assembled in a simple way.
  • the integral contact element also reduces the number of junctions in the electric connection between the stator body and the vehicle ground potential and, as a result, reduces the total electric resistance of this electric connection.
  • the direct electric connection between the stator body, the motor electronics ground terminal and the external-ground potential ensures good EMC characteristics of the motor vehicle auxiliary unit according to the invention.
  • a transversal stator body top side is provided with an axial contact opening, wherein the stator body contact element is plugged into the contact opening.
  • the stator body is provided with an electrically isolating protection coating.
  • the stator body contact element is preferably provided with at least one cutting element penetrating the isolating stator body coating to provide an electric contact with the stator body.
  • the cutting element also fixes the external-ground connector lug to the stator body.
  • the contact ring is provided with an axially extending plug cylinder and with a support flange laterally projecting from the plug cylinder.
  • the plug cylinder is plugged into the contact opening and radially contacts the inside surface of the contact opening.
  • the support flange is in axial contact with the stator body top side to define the intrusion depth of the plug cylinder into the contact opening. This provides a simple and reliable positioning of the external-ground connector lug with respect to the stator body.
  • the outside diameter of the plug cylinder is slightly larger than the opening diameter of the contact opening.
  • the term "opening diameter” always means the diameter of the unstressed contact opening, i.e. the diameter of the contact opening before the stator body contact element is plugged into the contact opening. Since the plug cylinder outside diameter is slightly larger than the opening diameter of the contact opening, the plug cylinder abrades the isolation from the inside surface of the contact opening when being pressed into the contact opening. As a result, the plug cylinder provides a reliable electric contact with the stator body as well as a robust fixation of the external-ground connector lug to the stator body.
  • the contact ring is provided with several cutting elements which are distributed along the outside circumference of the contact ring and which axially protrude over the contact ring bottom side.
  • the cutting elements penetrate the stator body isolation coating if the contact ring is pressed against the stator body top side.
  • the penetrating cutting elements provide a reliable electric connection and avoid a lateral shifting of the stator body contact element with respect to the stator body.
  • a separate fastening means is provided which extends through the contact ring into the contact opening and axially presses the contact ring against the stator body top side.
  • the fastening means is provided with an axially extending pin and a laterally extending head.
  • the pin axially extends through the contact ring into the contact opening to fix the fastening means within or at the stator body in that way that the head axially presses the contact ring against the stator body.
  • the fastening means can, for example, be a rivet or a screw.
  • the fastening means provides a robust fixation of the external-ground connector lug.
  • the axial pressure generated by the fastening means also provides a reliable electric contact with the stator body, in particular if the stator body contact element is provided with cutting elements.
  • the unit connector plug also comprises a power connector lug being electrically connected with the motor electronics for energizing the motor electronics so that no additional connector plug is required for energizing the motor electronics.
  • the motor vehicle auxiliary unit is provided with a sensor element and the unit connector plug comprises at least one sensor connector lug being electrically connected with the sensor element.
  • the sensor element can, for example, be a pressure sensor or a speed sensor being externally readable/programmable via the sensor connector lug of the unit connector plug. As a result, no additional sensor connector plug is required.
  • the electric motor 12 comprises a rotatable permanent magnetic motor rotor 20 and a static motor stator 22 with a ferromagnetic stator body 24 and a single stator coil 26.
  • the motor rotor 20 is co-rotatably connected with the pump wheel 14.
  • the stator body 24 is a laminated stator body which is coated with an electrically isolating protection coating 27.
  • the stator body 24 is provided with an axial contact opening 46 which in the present embodiment of the invention is provided with a circular cross section and which extends from a stator body top side 48 along the entire axial height of the stator body 24 to a stator body bottom side 50.
  • the electric motor 12 also comprises a motor electronics 28 being electrically connected to the stator coil 26 for energizing the stator coil 26 for driving the motor rotor 20 and, as a result, for driving the pump wheel 14.
  • the unit connector plug 18 comprises a plug housing 30 and is provided with three sensor connector lugs 32, a power connector lug 34 and an external-ground connector lug 36, which are externally electrically contactable. All connector lugs 32,34,36 are stamped out of a single metal sheet and post-processed by a mechanical deformation process.
  • the sensor connector lugs 32 are internally electrically connected with the sensor element 16 for energizing the sensor element 16 and/or for providing a data interface for reading/writing data from/to the sensor element 16.
  • the power connector lug 34 is internally electrically connected with the motor electronics 28 and externally connectable to an external energy source, for example to a motor vehicle battery, for providing the motor electronics 28 with electric energy.
  • the external-ground connector lug 36 is provided as a single-piece three-way electric connector comprising an external-ground pin 38, a motor electronics contact element 40 and a stator body contact element 42.
  • the external-ground pin 38 is externally connectable to an external motor vehicle ground potential.
  • the motor electronics contact element 40 provides a direct electric connection with the motor electronics 28, in particular with a ground terminal 44 of the motor electronics 28.
  • the stator body contact element 42 provides a direct electric contact with the stator body 24.
  • the stator body contact element 42 is provided with a substantially laterally extending support bar 52 and with an arrowhead-shaped cutting element 54.
  • the stator body contact element 42 is plugged into the contact opening 46 in that way that the support bar 52 is in axial contact with the stator body top side 48 and that the cutting element 54 intrudes into the contact opening 46.
  • the lateral width of the cutting element 54 is slightly larger than the opening diameter of the contact opening 46 so that the cutting element 54 cuts into the sidewalls of the contact opening 46.
  • the cutting element 54 cuts through the isolation coating 27 of the stator body 24 so that the cutting element 54 provides a reliable electric contact with the stator body 24.
  • the cutting element 54 also reliably positions the stator body contact element 42 with respect to the stator body 24 during the assembling process.
  • the stator body contact element 42" is fastened to the stator body 24 by a separate fastening means 62 which in the present embodiment of the invention is a screw with a transversal screw head 64 and an axially extending screw pin 66.
  • the screw head 64 is in axial contact with the top side of the contact ring 56".
  • the screw pin 66 axially extends from the screw head 64 through the contact hole 46 and is threaded into a corresponding nut 68 being located at the bottom side of the stator body 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Claims (11)

  1. Kraftfahrzeughilfsaggregat (10), umfassend
    - einen elektronisch kommutierten Elektromotor (12) mit
    • einem permanentmagnetischen Motorrotor (20)
    • einem Motorstator (22) mit einem ferromagnetischen Statorkörper (24) und mindestens einer Statorspule (26), und
    • einer Motorelektronik (28) mit einem Masseanschluss (44), und
    - einen Aggregatanschlussstecker (18) mit zumindest einer Außenmasseanschlussfahne (36), die mit dem Motorelektronikmasseanschluss (44) direkt elektrisch verbunden ist,
    - wobei die Außenmasseanschlussfahne (36) ein integriertes Statorkörperkontaktelement (42; 42'; 42") aufweist, das sich zu dem Statorkörper (24) erstreckt und eine direkte elektrische Verbindung mit dem Statorkörper (24) herstellt.
  2. Kraftfahrzeughilfsaggregat (10) nach Anspruch 1, wobei eine quer verlaufende Statorkörperoberseite (48) eine axiale Kontaktöffnung (46) aufweist, und
    wobei das Statorkörperkontaktelement (42; 42') in die Kontaktöffnung (46) gesteckt ist.
  3. Kraftfahrzeughilfsaggregat (10) nach einem der vorhergehenden Ansprüche, wobei der Statorkörper (24) eine elektrisch isolierende Beschichtung (27) aufweist, und
    wobei das Statorkörperkontaktelement (42; 42") mindestens ein Schneidelement (54; 54") aufweist, das die Statorkörperbeschichtung (27) durchdringt.
  4. Kraftfahrzeughilfsaggregat (10) nach Anspruch 2, wobei die Kontaktöffnung (46) im Wesentlichen kreisförmig ist, und
    wobei das Statorkörperkontaktelement (42'; 42") einen Kontaktring (56; 56") umfasst.
  5. Kraftfahrzeughilfsaggregat (10) nach Anspruch 4, wobei der Innendurchmesser des Kontaktrings (56") im Wesentlichen gleich dem Öffnungsdurchmesser der Kontaktöffnung (46) ist.
  6. Kraftfahrzeughilfsaggregat (10) nach Anspruch 4, wobei der Kontaktring (56) einen sich axial erstreckenden Steckzylinder (58) und einen von dem Steckzylinder (58) seitlich vorstehenden Stützflansch (60) aufweist,
    wobei der Steckzylinder (58) in die Kontaktöffnung (46) gesteckt ist und radial an der Innenfläche der Kontaktöffnung (46) anliegt, und wobei der Stützflansch (60) axial an der Statorkörperoberseite (48) anliegt.
  7. Kraftfahrzeughilfsaggregat (10) nach Anspruch 6, wobei der Außendurchmesser des Steckzylinders (58) geringfügig größer als der Öffnungsdurchmesser der Kontaktöffnung (46) ist.
  8. Kraftfahrzeughilfsaggregat (10) nach einem der Ansprüche 4 bis 7, wobei der Kontaktring (56") mehrere Schneidelemente (54") aufweist, die entlang des Außenumfangs des Kontaktrings (56") verteilt angeordnet sind.
  9. Kraftfahrzeughilfsaggregat (10) nach einem der Ansprüche 4 bis 8, wobei ein separates Befestigungsmittel (62) vorhanden ist, das sich durch den Kontaktring (56") hindurch in die Kontaktöffnung (46) hinein erstreckt und den Kontaktring (56") axial gegen die Statorkörperoberseite (48) drückt.
  10. Kraftfahrzeughilfsaggregat (10) nach einem der vorhergehenden Ansprüche, wobei der Aggregatstecker (18) mindestens eine Leistungsanschlussfahne (34) umfasst, die mit der Motorelektronik (28) elektrisch verbunden ist, um die Motorelektronik (28) mit Energie zu versorgen.
  11. Kraftfahrzeughilfsaggregat (10) nach einem der vorhergehenden Ansprüche, wobei ein Sensorelement (16) vorhanden ist, und
    wobei der Geräteanschlussstecker (18) mindestens eine Sensoranschlussfahne (32) umfasst, die mit dem Sensorelement (16) elektrisch verbunden ist.
EP18772788.8A 2018-09-17 2018-09-17 Hilfseinheit für ein kraftfahrzeug Active EP3853981B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/075015 WO2020057714A1 (en) 2018-09-17 2018-09-17 Motor vehicle auxiliary unit

Publications (2)

Publication Number Publication Date
EP3853981A1 EP3853981A1 (de) 2021-07-28
EP3853981B1 true EP3853981B1 (de) 2023-06-21

Family

ID=63637892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18772788.8A Active EP3853981B1 (de) 2018-09-17 2018-09-17 Hilfseinheit für ein kraftfahrzeug

Country Status (2)

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EP (1) EP3853981B1 (de)
WO (1) WO2020057714A1 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026833B1 (de) * 1979-09-07 1982-12-22 Siemens Aktiengesellschaft Schutzleiteranschluss für Motoren, insbesondere Aussenläufer-Kleinmotoren, und Verfahren für seine Herstellung
JP3543881B2 (ja) * 1995-11-08 2004-07-21 株式会社デンソー 交流発電機
WO2004088818A1 (ja) * 2003-03-31 2004-10-14 Matsushita Electric Industrial Co., Ltd. 信頼性の高いアース構造を有するモータ及びそのモータを搭載した電気機器
PL2500576T3 (pl) * 2011-03-12 2017-02-28 Grundfos Management A/S Pompa obiegowa do instalacji grzewczej
DE102012006020A1 (de) * 2012-03-24 2013-09-26 Minebea Co., Ltd. Stator für eine elektrische Maschine
KR101316144B1 (ko) * 2012-06-11 2013-10-08 뉴모텍(주) 모터
DE102014220201A1 (de) 2014-10-06 2016-04-07 Bühler Motor GmbH Elektronisch kommutierter Gleichstrommotor, insbesondere für eine Ölpumpe
DE102016223844B4 (de) * 2016-11-30 2022-01-27 Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg Elektromotor und Kühlerlüftermodul mit einem solchen Elektromotor

Also Published As

Publication number Publication date
WO2020057714A1 (en) 2020-03-26
EP3853981A1 (de) 2021-07-28

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